/Python/How to create one list from 2d list python

How to create one list from 2d list python

How to create 2d list in python

o=[]
for i in range(0,rows):
    x=[]
    for j in range(0,cols):
        x.append(0)
    o.append(x)
#if you use [[0]*cols]*rows all rows will become the same list
#so editing in one row will edit all rows

How to create one list from 2d list python

>>> l = [[1, 2, 3], [4, 5, 6], [7], [8, 9]]
>>> sum(l, [])
[1, 2, 3, 4, 5, 6, 7, 8, 9]

Python declare 2d list

length, breadth = x, y
matrix = [[-1 for j in range(breadth)] for i in range(length)]
# every element is -1

Similar codes

3 votes276 views1 answer
How to remove quotes from a string in python
Python
1 vote271 views1 answer
How to merge dataframe with different keys
Python
0 vote315 views1 answer
Django from
Python Django
25 votes284 views6 answers
Uninstall all packages python
Python
57 votes282 views6 answers
Print current date and time in python
Python
14 votes313 views1 answer
Python directory contains file
Python
4 votes268 views1 answer
Np.random.float
Python
24 votes289 views3 answers
Get first x characters of string python
Python
1 vote278 views1 answer
Pandas forward fill after upsampling
Python
1 vote269 views3 answers
Program to draw rectangle in python
Python